Method and device for the detection of SF6 decomposition products

a technology of sulphur hexafluoride and decomposition products, which is applied in the direction of chemical analysis using catalysis, material testing goods, immunoassays, etc., can solve the problems of high toxicity, health problems, and equipment corrosion

Inactive Publication Date: 2005-10-20
POWERTECH LABS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0029] The process can include a flow control wh

Problems solved by technology

Even these more stable gases will eventually further react with moisture or metal oxides and may lead to corrosion of the equipment.
In addition, many of these gases are highly toxic and pose a health issue to personnel performing maintenance, servicing or cleanup of the equipment.
SF6 decomposition products have a distinct acrid odour similar to that of rotten eggs but due to their toxic nature, this method of detection is discouraged.
The forewarning of the decomposition products anticipates costly breakdowns.
This method is not selective since some metallic deposits may also produce a change in resonant frequency

Method used

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  • Method and device for the detection of SF6 decomposition products
  • Method and device for the detection of SF6 decomposition products
  • Method and device for the detection of SF6 decomposition products

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Embodiment Construction

[0035] Throughout the following description, specific details are set forth in order to provide a more thorough understanding of the invention. However, the invention may be practiced without these particulars. In other instances, well known elements have not been shown or described in detail to avoid unnecessarily obscuring the invention. Accordingly, the specification and drawings are to be regarded in an illustrative, rather than a restrictive, sense.

[0036] The SF6 decomposition products detector (SF6DPD) is a portable hand held instrument intended for use by field personnel for the detection and location of SF6 decomposition products in SF6 gas filled electrical equipment, and in air. When electrical fault conditions occur, the location of the problem is not always evident. A circuit breaker may trip indicating an electrical fault somewhere in the circuit and the location of this fault requires testing of the separate gas compartments in the circuit.

[0037] The SF6DPD allows fo...

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Abstract

This invention is in the field of gas detection for sulphur hexafluoride (SF6) gas decomposition products, particularly for the detection of thionyl fluoride (SOF2) and sulphur dioxide (SO2). The invention relates to a novel portable handheld instrument that can readily detect SOF2, SF4 and SO2 in SF6 gas filled electrical equipment and in air. An apparatus for detecting SF6 decomposition products comprising: (a) an inlet for receiving SF6 gas containing SOF2 or SF4; (b) A chamber connected to the inlet and containing a catalyst which converts SOF2 or SF4 into SO2; and (c) an SO2 detector connected downstream of the chamber.

Description

REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit of the filing date of U.S. provisional application Ser. No. 60 / 561,910, filed 14 Apr. 2004.FIELD OF THE INVENTION [0002] This invention is in the field of gas detection for sulphur hexafluoride (SF6) gas decomposition products, particularly for the detection of thionyl fluoride (SOF2), sulphur tetrafluoride (SF4) and sulphur dioxide (SO2). The invention relates to a novel portable handheld instrument that can readily detect SOF2, SF4 and SO2 in SF6 gas filled electrical equipment, and in air. BACKGROUND OF THE INVENTION [0003] Sulphur hexafluoride (SF6) is a colorless, odorless, non-toxic and non-flammable gas. It has good dielectric and arc-quenching characteristics. These unique properties have made it a popular choice as a dielectric medium for high voltage equipment. Since its introduction in the 1950's, its popularity has grown to include circuit breakers, switches, current transformers, busbars, and ca...

Claims

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Application Information

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IPC IPC(8): G01N21/76G01N31/10G01N27/00G01N33/00G01N33/22H02B13/055
CPCY10T436/18G01N33/0042Y02A50/20
Inventor DOMINELLI, NICOLAWYLIE, IAN GORDON NORMANLEE, KEITH CHEUKLAP
Owner POWERTECH LABS
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